Page 1 of 1
NA cat rattle - Kill the cat?
Posted: Fri Dec 15, 2006 11:36 pm
by realfinn
Well I noticed a nice rattle coming from my cat. Aparantly the element has finally turned to gravel. What do you guys think about running a NA engine catless? Will it CEL all the time (like my last car did) or fowel plugs (again like my last car did)? What will be the negative effects?
Posted: Sat Dec 16, 2006 2:41 am
by Splinter
How did running catless foul your plugs?
Posted: Sat Dec 16, 2006 2:52 am
by realfinn
According to the GM guy when the car was run without the cat the decrease in back pressure effected the O2 readings. The O2 sensor made the fuel map crazy and I ran it like that. It started fouling plugs about every 10K. I guess the early GM ECU's were pretty picky. The CEL came on right after I gutted the cat. Everything went to hell in a hand bag after that.
Posted: Sun Dec 17, 2006 11:05 pm
by Legacy777
I don't see how not running a cat on a subaru could cause the plugs to foul.
Posted: Mon Dec 18, 2006 12:29 am
by 206er
when i was running catless it did run slightly rich and I am pretty sure the o2 sensor was good.
Posted: Mon Dec 18, 2006 7:16 am
by 555BCTurbo
206er wrote:when i was running catless it did run slightly rich and I am pretty sure the o2 sensor was good.
It may smell a bit richer, but that is just because the cat isn't there to filter out the particulates and hydrocarbons that it normally would...
Catless works fine...go for it!
Posted: Mon Dec 18, 2006 6:56 pm
by turboleg
Will it be noticeably louder?
I noticed on my EJ22T it got louder when I ran the gutted cat.
Posted: Wed Apr 23, 2008 12:48 am
by SubiePrice88
My N/A just started to do the same rattle, I was wondering the same thing.
Posted: Wed Apr 23, 2008 2:13 am
by evolutionmovement
Are you sure it's internal and not just the heat shield? That can be fixed with two large band clamps from Home Depot.